earned run average

noun Baseball.
a measure of the effectiveness of a pitcher, obtained by dividing the number of earned runs scored against the pitcher by the number of innings pitched and multiplying the result by nine. A pitcher yielding three earned runs in nine innings has an earned run average of 3.00. Abbreviation: ERA, era

Origin:
1945–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
earned run average

noun
(baseball) a measure of a pitcher's effectiveness; calculated as the average number of earned runs allowed by the pitcher for every nine innings pitched 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Either the calendar lies, or his earned run average does.
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